fix: feature detection for Google Chrome

Old version did not check if chrome.sockets.* actually exist.
This caused problems with extensions built for Chromium-based browsers
that tried to maintain the single codebase and do feature-detection
at runtime.

License: MIT
Signed-off-by: Marcin Rataj <[email protected]>

Author: lidel

index.js

@@ -23,7 +23,14 @@ var servers = {}
 var sockets = {}
 
 // Thorough check for Chrome App since both Edge and Chrome implement dummy chrome object
-if (typeof chrome === 'object' && typeof chrome.runtime === 'object' && typeof chrome.runtime.id === 'string') {
+if (
+  typeof chrome === 'object' &&
+  typeof chrome.runtime === 'object' &&
+  typeof chrome.runtime.id === 'string' &&
+  typeof chrome.sockets === 'object' &&
+  typeof chrome.sockets.tcpServer === 'object' &&
+  typeof chrome.sockets.tcp === 'object'
+) {
   chrome.sockets.tcpServer.onAccept.addListener(onAccept)
   chrome.sockets.tcpServer.onAcceptError.addListener(onAcceptError)
   chrome.sockets.tcp.onReceive.addListener(onReceive)